boxy-fixture-sb

{"modified":"2026-08-05T14:32:24Z","published":"2026-08-05T14:32:24Z","schema_version":"1.7.4","id":"MAL-2026-13048","summary":"Malicious code in boxy-fixture-sb (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (569ec5c3f70be02f417bbbe5694a31d6c7d48dadfcacc2500455fffb5ff23d07)\nOn require() of boxy-fixture-sb, index.js loads _compat.js which reconstructs Cloudflare Workers hostnames from string-split arrays (joined at runtime to form oob-worker.cf*.workers.dev), downloads a platform-specific binary via https.get, writes it to /tmp or %TEMP% under cover-story names such as.cache_<hex> and dotnet_diag_<hex>.exe, chmods 0755, and spawns it detached via /bin/sh -c \"<path> &\" or cmd.exe /c start. A DNS-TXT fallback channel reads base64 payload chunks from c.<domain>/<i>.<domain> under *.dl.wel1.ru. Cover-story identifiers (analytics_state, DISABLE_TELEMETRY) and hostname obfuscation confirm evasion intent. The package name suggests a test fixture but its only observed effect at import is fetching and executing an opaque remote payload on the installer's machine.\n","affected":[{"package":{"ecosystem":"npm","name":"boxy-fixture-sb"},"versions":["35.9.6"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"indicators":{"evidence_files":[{"path":"_compat.js","sha256":"6529ddf8c3586a1ae8e69c4b2b1eae641d45fc9ef55983d14064b5e38bb57f31","tlsh":"b6a1b7aa06a670188bb0d7e4c7175416f65bf6633780c298fb9c59980f76124c3b2efc"}],"package_integrity":[{"filename":"boxy-fixture-sb-35.9.6.tgz","hashes":{"sha1":"e0092871a995b05c55f6992843aa72acf11c5cf8","sha512_sri":"sha512-CmV+DWgV7skUNU8mG4cHGC2PDtDRCLxbpgMaunk3mlMeAQItcAk8Ll4nBZGcrRRlgjKz47dkZ64FM81u8nCXOg=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/boxy-fixture-sb/v/35.9.6"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015341","import_time":"2026-08-05T15:19:45.815946781Z","modified_time":"2026-08-05T14:32:24Z","sha256":"569ec5c3f70be02f417bbbe5694a31d6c7d48dadfcacc2500455fffb5ff23d07","source":"amazon-inspector","versions":["35.9.6"]}]}}